saulonpb's 1943 scores have been DQ'ed for somehow managing to break 3 rules at once - using two players at once, mapping both players inputs' together, and autofire. I don't know why he thought he could get away with this...

If you have problems with any of his other recordings, please be specific as to which ones.

Except pretty much all the rest of his recordings with "master keyboard" in the description have not broken any MARP rules, as far as I know. Like I said, if you have found anything specific (as in, you downloaded the inp and played it back and noticed a rules violation), then let us know.

Not all the scores marked with Master Keyboard string are invalid. And my opinion on this...
We can/should not ban someone because he/she sends too many recordings that go against the rules. The person behind the nick PG3 has surely done lot of mistakes, like having more accounts with the same email, but still he has one account to use for sending his plays. And everybody remembers what did Pengafin in the K10... yet his account is still allowed to submit scores; he doesn't play anymore it seems <irony> and I wonder why! </irony> but there you can find it.
Same has to go with saulonpb, he won't be banned. The spirit of not banning but invalidating the scores againsts the rules is to underline the fact that he has done bad, the invalid score will stay there as a mark, a memory, and to say that he can still repair and return in a situation of regularity but only if he stops to cheat. Correct people's mistakes, do not punish them.
His punishment, as well as others had, is that he is compromising his situation and giving himself a bad name/reputation. As well as, like BBH said, he is wasting his time.